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Hemsworth, 22, proposed to Cyrus, 19, in May and reports of their alleged baby talk has led to speculation that the former Disney star may already be pregnant with the couple's first child.

"Miley and Liam really want to have a baby quickly," a Cyrus family source told Us Weekly Magazine.

"They are both mature and ready for this, Miley is 19 going on 40," a source added.

The young couple, who have been dating for two years, stunned fans when they announced their sudden engagement and many critics flocked to social networking site Twitter to weigh in on Cyrus' rumored pregnancy.